Judging from that stream the game has a long way before being finished. At least if you want a shred of realism involved. Dropping paratroopers over 800 km into hostile territory, which in real life would be an impossible feat due to fighter coverage, AAA, fuel limit etc. Also the AI seems broken (USSR collapsing too easily and USA + Japan not doing anything usefull before humans took control).
Also there should be some tweaks on the players ability to move entire massive fleets past enemy held coastal waters with impunity. If the royal navy would just sail through the Danish straits they would take massive losses. If not by mines, then by German air power.